Ayn Rand individualism is better than 1930's good because you're innately good.
It's far more interesting and layered for a character like Batman or Superman, who have a lot of hurdles to face, personal and external, and to in the face of trying challenges and scenarios to always CHOOSE the option of being good.
For me a Superman that suffers the very human condition of doubt and uncertainty, for him to choose to continuously do good for those that are even against him is the best ideal that Superman can inspire in people.
I'll take this, however much Snyder may fall short of portraying the characters in the best way possible, over text book golden age superhero garbage, every. Single. Day.
And in actuality I think he did a rather good job of showing this individualism posited against superheroism.
A person seeing a born good, can never do harm character always doing good no matter what isn't going to come away with anything. A person seeing a fallible character who has immense power but suffers in ways that anyone else suffers, but continuously chooses to do the better from any option presented, that's what inspires people. People are accountable for themselves, individualism is great.